Java中double型數據如何四捨五入？

假設咱們要用四捨五入法保留兩位小數

public class Main{
    public static void main(String[] args){
        double abc = 4.015;//  we would like to get the result 4.02
        System.out.println(new java.math.BigDecimal(Double.toString(abc)).setScale(2, java.math.BigDecimal.ROUND_HALF_UP).doubleValue());
    }    
}

Reference 1